TM 9-2320-289-3410-21. AIR CONDITIONING SYSTEM SERVICING (M1010) (Cont).b.EVACUATING SYSTEM CAUTIONCompressor (10) should not be used as a vacuum pump. Failure to followthis caution may result in damage to compressor.NOTEIf air conditioning system is determined to be leaking at any time whileperforming EVACUATING SYSTEM, air conditioning system will have to becharged and checked for leaks.1.Connect center hose (6) to vacuum pump (11), Completely open low side valve (1) and highside valve (4), Open discharge valve on vacuum pump.2.Start vacuum pump (11), Low side gage (2) should go down to 29 in. Hg. If 29 in. Hg is notobtained, there is a leak in air conditioning system. Locate leak, if present, using refrigerantgas leak detector. Repair leak in system, if present, before performing step 3.TA5044810-81